September 2005
Volume 5, Issue 8
Vision Sciences Society Annual Meeting Abstract  |   September 2005
Ability of contours to block rapid color filling-in is dependent on global configuration
Author Affiliations
  • Daw-An Wu
    California Institute of Technology, USA
  • Ryota Kanai
    Utrecht University, the Netherlands
  • Shinsuke Shimojo
    California Institute of Technology, USA, and NTT Communication Science Laboratory, Japan
Journal of Vision September 2005, Vol.5, 718. doi:
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      Daw-An Wu, Ryota Kanai, Shinsuke Shimojo; Ability of contours to block rapid color filling-in is dependent on global configuration. Journal of Vision 2005;5(8):718. doi:

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      © ARVO (1962-2015); The Authors (2016-present)

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If a thin luminance contour and a larger solid disk are dichoptically flashed to opposite eyes, a dark hole is seen in the disk. The contour masks the disk's interior by blocking brightness information which normally “fills-in” from disk's edge (Paradiso and Nakayama, 1991). Using color versions of this paradigm, we find that a color contour mask can weaken if it is part of a larger global configuration. Here, adding to a mask decreases its blocking power, perhaps because the addition provides cues that the configuration is a separate, occluding surface. Method: A solid red disk (target) and thin green contour (mask) are flashed simultaneously to opposite eyes. The mask is either square or #-shaped (the same square with arms extending outside the target). The stimulus repeats until the subject responds. The task is to adjust the intensity of a peripheral color patch to match the redness perceived within the center of the mask. Result: subjects found the # to mask more weakly than the square, reporting the central redness to be significantly more intense in # trials. Some subjects reported that the # configuration often failed to mask the center at all, while the square configuration was a consistently strong mask. When the experiment was run using achromatic stimuli, subjects saw no significant difference between masks, some found the # to be the stronger mask. Discussion: Previously, we showed that the slow color filling-in underlying Troxler fading can jump over luminance contours and fill discretely to remote areas. The ability of a contour to block filling-in is based not only on its local contrast properties, but also on global surface segregation. Here, we extend this finding to the rapid filling-in underlying normal perception. The #-shaped mask is seen to be separate from the disk's surface, which weakens the ability of the square portion of the # to block the filling-in of the disk. However, this does not seem to apply to the filling-in of achromatic brightness.

Wu, D.-A. Kanai, R. Shimojo, S. (2005). Ability of contours to block rapid color filling-in is dependent on global configuration [Abstract]. Journal of Vision, 5(8):718, 718a,, doi:10.1167/5.8.718. [CrossRef]
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